Automatic stoker for mine refuse or other very fine fuel.



No..7l5,826. Patented Dec. l6, I902. J. MAcCORMACK. AUTOMATIC STOKER FOR MINE REFUSE OR OTHER VERY FINE FUEL.

(Application filed Sept. 12, 1901.]

2 Shuts-Sheet I.

(No Model.)

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Inventor A awufi No. 7|5,826. v

J. mAcco mAcK.. AUTOMATIC STOKER FOR MINE REFUSE OR OTHER VERY FINE FUEL.

(Application filed Sept. 12, 1901.) (No Model.)

Wnnesses 20 banks on both sides of the magazine.

UNITED, STATES PATENT OFFICE.

JOI'IN MACOORMAOK, OF BAYONNE, NEW JERSEY, ASSIGNOR TO ROYAI O.

PEABODY, OF BROOKLYN, NEW YORK.

AUTOMATIC STOKER FOR MINE REFUSE OR OTHER VERY FINE FUEL.

SPECIFICATION forming part of Letters Patent N 0. 715,826, dated December 16, 1902.

Application filed September 12,1901. Serial No. 75,169. (No model.)

To all whmn it may concern:

Be it known that 1, JOHN MAoOoRMAcK, a citizen of the United States, residing at Bayonne, in the county of Hudson and State of New Jersey, have invented a certain new andusefullmprovementin Automatic Stokers for Mine Refuse or other Very Fine Fuel, of which the following is a description.

My invention relates to improvements in to automatic stokers for use with very fine fuel,

such as mine refuse.

In my Patent No. 679,275, dated July 23, 1901, I describe and claim improvements in automatic stoking mechanism wherein is used a magazine having flaring upper walls surmounted by twyer-blocks and containing a vertically-reciprocating platen, to which fuel is continuously supplied from a feeding-tunnel, the grate-bars being arranged in two In operation the platen elevates the fuel, causing it to pile over the twyer-blocks and spread out upon the grate-bars. On the return downward stroke of the platen the fuel within the upper portion of the magazine bridges over between the flaring walls thereof, so as not to follow the platen to the bottom of its downward stroke. With mine refuse and other very fine fuel it is desirable that independent means should be interposed in the magazine for blocking the fuel in the upper portion thereof and preventing it from merely moving up and down with the platen. My present application provides a device for this purpose and makes the stoker especially applicable for use with such fine fuel.

In order that the invention may be better understood, attention is directed to the accompanying drawings, forming part of this specification, and in which Figure l is a cross-sectional view of a furnace equipped with my present improvements; Fig. 2, a sectionon the line 2 2 of Fig. 1, and Fig. 3 a detailed perspective view show- 5 ing one pair of movable gates.

In all of the above views corresponding parts are represented by the same numerals of reference.

1 1 are the side walls of the furnace, 2 the front wall thereof, and 3 the bridge-wall, all

constructed as heretofore.

4 4 are twyer-blocks carried on the front and bridge walls, respectively, of the furnace, and 5 5 are corresponding twyer-blocks, preferably embedded in the side walls of the furnace, as shown, and which may connect with the twyer-blocks 4 4. All of these blocks are made, preferably, in sections, as is common, in order that they may be removed or interchanged when desired. The blocks 4 4' are carried on angles 6, as shown. Mounted in suitable bearings in the blocks 4 4 are the grate-bars 7, each preferably formed of a series of sections of cast-iron,though obviously other materials may be used. The grate-bars are carried on shafts 9, rounded at the ends to take into bearings in the twyers 4 4'. I illustrate the grate-bars as being arranged in two sets, inclining slightly away from a central magazine 12, located at the center of the ash-pit, whereby material introduced vertically upward through the magazine will be distributed equally to the two sets of gratebars and by the latter will be fed uniformly over their entire area, as will be explained. -Mounted to reciprocate in the magazine is a platen or platform 13, the latter being reciprocated vertically, as I describe in my said patent, from a lever connected with .an eccentric 13 on a power-driven shaft 14.

Mounted on said shaft is a feed-worm 14, by means of which the fuel is supplied from a hopper 15 to the magazine above the platform 13. The hollow grate-bars 7, immediately adjacent to the magazine, constitute rotating twyers, and each of these bars is mounted above the hollow walls 16 of the magazine, which walls are supplied with air under pressure through pipes 17, whereby the air will be blown through the rotating twyers, so that the latter will be kept entirely cool and will properly supply the necessary oxygen for combustion. At its end the magazine 12 is provided with ordinary stationary twyerblocks 18, as shown. If desired, a low-pres sure pipe 19 may be located in the ash-pit on either side of the magazine to supplyair below the grate-bars when a forced draft is desired. At the outside of each grate-section I provide a clinker-receiving apron 20, onto which the clinkers from the grate-sections are deposited. Each apron is supported on a series of arms 21, keyed to a rock-shaft 22, which extends through the front wall 2, so as to be operative from the outside when it is desired to dump the clinkers from the aprons 20. The rotating grate-bars 7 are rotated in the same direction by any suitable mechanism for the purpose. In the drawings I illustrate a toothed bar 23, mounted beneath the grate-bars of each set near the front of the furnace. This toothed bar at its inner end is carried on a lever 24-, pivoted in a bracket at the side of the magazine, and at its other end the toothed bar is connected to an eccentric 26 on a shaft 27. The teeth of the toothed bar 23 are so disposed as to engage with the slots or openings 11 in the several grate-bars, or, if desired, said grate-bars may be formed with special openings therein for the engagement of said teeth therewith. Each shaft is rotated in any suitable way.

It will be obvious that as either shaft 27 is rotated in the direction of the arrow the elevation of the pivot connection with the toothed bar 23 above the horizontal plane of said shaft will engage the feed-bar with the several grate-bars, which devices will then be rotated to a slight extent. As the connection with the toothed bar passes below the horizontal plane of the shaft 27 the toothed bar will be withdrawn downwardly from engagement with the rotating devices, so that the latter will remain stationary. Thus an intermittent feed movement will be given to the twyers and grate-bars to slowly advance the fuel fed from the magazine to the grate-sections toward the side walls of the furnace, whereby the clinker will be fed from the grate-sections and will accumulate on the aprons 20, which can be dumped from time to time from the outside.

With mypresent improvement I make use, preferably, of a pair of gates 30, which are pivoted in recesses in the inner walls of the magazine. Obviously instead of two opposing gates only a single gate may be employed, extending across the magazine and pivoted at one side. The gates, as shown in Fig. 3, are made, preferably, in sections strung on the pivot-rod 31 and provided with slots pr perforations 32 therein to permit any gases to pass up through the gates, and thereby prevent the possibility of explosion within the magazine. lhe platform 13 is also provided at its sides with rollers 33, which closely engage the side walls of the magazine, so that as the platform is elevated such rollers will engage the gates 30 to completely open the same, permitting the charge of fuel on the magazine to be elevated up through the magazine and be forced out upon the grate-surfaces. As the platform 13 descends in its movement the gates 30 will obviously close by their weight, so that the fuel, however fine it may be, will be prevented from following the platform to its downward limit. It will be observed that the gates in opening will move upwardly and outwardly from each other, following the dotted lines shown, so as to tend to break up any clinkered material which may accumulate in their path.

Having now'described my invention, what Iclaim as new, and desire to secure by Letters Patent, is as follows:

1. In an automatic stoker, the combination with a magazine and grate-bars arranged near the upper end thereof, of a vertically-movable platform in the magazine, means for supplying fine fuel to said platform, and a pivoted gate in the magazine arranged to open upwardly to permit the passage of fuel elevated by said platform, substantially as and for the purposes set forth.

2. In an automatic stoker, the combination witha magazine and grate-bars arranged near the upper end thereof, ofa vertically-movable platform in the magazine, means for supplying fine fuel to said platform, and a pivoted slotted gate in the magazine arranged to open upwardly to permit the passage of fuel elevated by said platform, substantially as and for the purposes set forth.

3. In an automatic stoker, the combination with a magazine and grate-bars arranged near the upper end thereof, ofa vertically-movable platform in the magazine, means for supplying fine fuel to said platform, and a pivoted slotted sectional gate in the magazine arranged to open upwardly to permit the passage of fuel elevated by said platform, substantially as and for the purposes set forth.

4. In an automatic stoker, the combination with a magazine and grate-bars arranged near the upper end thereof, of a vertically-movable platform in the magazine, means for supplying fine fuel to the platform, and apair of pivoted gates in the magazine arranged to open upwardly and outwardly to permit the passage of fuel elevated by said platform, substantially as and for the purposes set forth.

5. In an automatic stoker, the combination withamagazine and grate-bars arranged near the upper end thereof, of a vertically-movable platform in the magazine, means for supplying fine fuel to the platform, and a pair of pivoted sectional gates in the magazine arranged to open upwardly and outwardly to permit the passage of fuel elevated by said platform,substantially as and for the purposes set forth.

This specification signed and witnessed this 6th day of August, 1901.

JOHN MACCORMACK.

Witnesses:

FRANK L. DYER, J NO. RoBT. TAYLOR. 

